how to merge 200 csv files in Python

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Guys, I here have 200 separate csv files named from SH (1) to SH (200). I want to merge them into a single csv file. How can I do it?

As ghostdog74 said, but this time with headers:

fout=open("out.csv","a")
# first file:
for line in open("sh1.csv"):
    fout.write(line)
# now the rest:    
for num in range(2,201):
    f = open("sh"+str(num)+".csv")
    f.next() # skip the header
    for line in f:
         fout.write(line)
    f.close() # not really needed
fout.close()

How to combine multiple CSV files with 8 lines of code, If all the files have the same table structure (same headers & number of columns), let this tiny Python script do the work. Step 1: Import packages and set the working directory. Step 2: Use glob to match the pattern 'csv' Step 3: Combine all files in the list and export as CSV. Use accepted StackOverflow answer to create a list of csv files that you want to append and then run this code: import pandas as pd combined_csv = pd.concat( [ pd.read_csv(f) for f in filenames ] ) And if you want to export it to a single csv file, use this: combined_csv.to_csv( "combined_csv.csv", index=False )

Why can't you just sed 1d sh*.csv > merged.csv?

Sometimes you don't even have to use python!

how to merge 200 csv files in Python, Guys, I here have 200 separate csv files named from SH (1) to SH (200). I want to merge them into a single csv file. How can I do it? Answers:. Steps to merge multiple CSV(identical) files with Python. Note: that we assume - all files have the same number of columns and identical information inside. Step 1: Import modules and set the working directory. First we will start with loading the required modules for the program and selecting working folder:

Use accepted StackOverflow answer to create a list of csv files that you want to append and then run this code:

import pandas as pd
combined_csv = pd.concat( [ pd.read_csv(f) for f in filenames ] )

And if you want to export it to a single csv file, use this:

combined_csv.to_csv( "combined_csv.csv", index=False )

How to concatenate multiple CSV files in one single CSV with Python, This video is extracted from the complete Python course " Data Processing with Python" which Duration: 6:19 Posted: Jul 29, 2015 Use accepted StackOverflow answer to create a list of csv files that you want to append and then run this code: import pandas as pd combined_csv = pd.concat( [ pd.read_csv(f) for f in filenames ] ) And if you want to export it to a single csv file, use this: combined_csv.to_csv( "combined_csv.csv", index=False )

fout=open("out.csv","a")
for num in range(1,201):
    for line in open("sh"+str(num)+".csv"):
         fout.write(line)    
fout.close()

how to merge 200 csv files in Python, Guys I here have 200 separate csv files named from SH 1 to SH 200 I want to merge them into a single csv file How can I do it Merge Multiple CSV Files in Python. Below is the complete code to perform the merging of CSV files. We used a CSV format which records the performance data for web services. While using this example, you may need to modify the HEADER variable (with the name of actual fields) as per the format of your CSV.

I'm just gonna through another code example in the basket

from glob import glob

with open('singleDataFile.csv', 'a') as singleFile:
    for csvFile in glob('*.csv'):
        for line in open(csvFile, 'r'):
            singleFile.write(line)

Python merge csv files into one excel, Parsing CSV Files With Python's Built-in CSV Library The csv library provides files into one, it is working super fine with csv files of smaller size (till 200 MB)  How To / Python: Combine multiple CSV files into one. If you have multiple CSV files with the same structure, you can append or combine them using a short Python script. Suppose you have several files which name starts with datayear. For instance, datayear1980.csv, datayear1981.csv, datayear1982.csv.

How To / Python: Combine multiple CSV files into one, If you have multiple CSV files with the same structure, you can append or combine them using a short Python script. Suppose you have several  Merge-Combine-CSV-files---PYTHON How to merge or combine multiple files. First write your new file name (WARNING: if you have another file with the same name). PS: If you want to skip header from all your files, check the CheckBox.

Merge csv files python, Merge CSV Files in Python with Different file names. Therefore you can pull the files at the arrows to reorder. how to merge 200 csv files in Python. csv, file2. Merge two spreadsheets using python - Source of columns in new sheets alternates between source files Tag: python , python-2.7 , csv I would like to write a python code to merge two spreadsheets in .csv format so that the first column in the new sheet is from either of the source sheets and all other new columns are derived in alternating order

How to merge multiple CSV files with Python, In this guide, I'll show you several ways to merge/combine multiple CSV files into a single one by using Python (it'll work as well for text and  Python | Using Pandas to Merge CSV Files. When you have a set of CSV files in a multitude of 100s or 1000s, then it is impossible to combine them manually. But, if you try to do so, then it may lead to incorrect merge and a lot of errors.

Comments
  • In what way would you merge them? (Concatenate lines, ...)
  • How do you want them merged? Each line in a CSV file is a row. So one simple option is to just concatenate all the files together.
  • Each file has two columns. I want to merge them into a single file with two columns consecutively.
  • @Chuck: Howzabout about taking all the responses in your comments (to the question, and to the answers) and updating your question?
  • This question should be named "How to concat..." instead of "how to merge..."
  • you can use f.__next__() instead if f.next() in python3.x.
  • Just a note: One can use the with open syntax and avoid manually .close()ing the files.
  • what's the difference between f.next() and f.__next__()? when I use the former, I got '_io.TextIOWrapper' object has no attribute 'next'
  • before fout.write(line) I would do: if line[-1] != '\n': line += '\n'
  • On windows, C:\> copy *.csv merged.csv
  • Copy the header information from one file: sed -n 1p some_file.csv > merged_file.csv Copy all but the last line from all other files: sed 1d *.csv >> merged_file.csv
  • @blinsay It adds the header in each CSV file to the merged file as well though.
  • How do you use this command without copying the header information for each subsequent file after the first one? I seem to be getting the header info popping up repeatedly.